im4aLL

class Event {
    static events = [];

    static listen(name, callback) {
        if (!Event.events[name]) {
            Event.events[name] = [];
        }

        Event.events[name].push(callback);
    }

im4aLL

/*
A binary gap within a positive integer N is any maximal sequence of consecutive zeros that is surrounded by ones at both ends in the binary representation of N.

For example, number 9 has binary representation 1001 and contains a binary gap of length 2. The number 529 has binary representation 1000010001 and contains two binary gaps: one of length 4 and one of length 3. The number 20 has binary representation 10100 and contains one binary gap of length 1. The number 15 has binary representation 1111 and has no binary gaps. The number 32 has binary representation 100000 and has no binary gaps.

Write a function:

function solution(N);

that, given a positive integer N, returns the length of its longest binary gap. The function should return 0 if N doesn't contain a binary gap.

im4aLL

/*
An array A consisting of N integers is given. Rotation of the array means that each element is shifted right by one index, and the last element of the array is moved to the first place. For example, the rotation of array A = [3, 8, 9, 7, 6] is [6, 3, 8, 9, 7] (elements are shifted right by one index and 6 is moved to the first place).

The goal is to rotate array A K times; that is, each element of A will be shifted to the right K times.

Write a function:

function solution(A, K);

that, given an array A consisting of N integers and an integer K, returns the array A rotated K times.

im4aLL

// webpack/modules/babel-loader-rule.js
module.exports = {
    test: /\.js$/,
    exclude: /(node_modules|bower_components)/,
    use: {
        loader: 'babel-loader',
        options: {
            presets: [
                ['@babel/preset-env', { targets: "defaults" }]
            ]

im4aLL

version: '3.8'

services:

  mongo:
    image: mongo:latest
    volumes:
      - ./.data/mongodb:/data/db
    environment:
      MONGO_INITDB_ROOT_USERNAME: root

im4aLL

// 1
console.log(typeof typeof 1);

// 2
console.log(018 - 015);

// 3
const numbers = [33, 2, 8];
numbers.sort();
console.log(numbers[1]);

im4aLL

// Guard Clause is a technique derived from the fail-fast method 
// whose purpose is to validate a condition and immediately stop the code execution 
// about the result of the validation.
// Using guard clauses is a common and clean technique for simplifying the code block and avoiding unnecessary complexity.

// Example 1
const submitForm = (formData, formMeta) => {
  if (!formMeta.hasError(formData)) {
    formData.submit(); 
  }

im4aLL

// The Adapter pattern is a structural design pattern that allows objects with incompatible interfaces to work together.

interface NotificationInterface {
  send(subject: string, message: string): boolean;
}

class EmailNotification implements NotificationInterface {
  send(subject: string, message: string): boolean {
    console.log(`Sending email notification: ${subject} ${message}`);
    return true;

im4aLL

type UserUrl = string;

// const getUserUrl = (id: number) => {
//   return `/user/${id}`; // as const
// };

// type UserUrl = ReturnType<typeof getUserUrl>;

const url: UserUrl = '/user/2';

im4aLL

version: '3.8'

services:

  db:
    image: mysql
    container_name: db
    environment:
      MYSQL_ROOT_PASSWORD: ${DB_PASSWORD}
      MYSQL_DATABASE: ${DB_DATABASE}